Dyes of the triphenylmethane series and process of making same.



UNITED, STATES. FATE AUGUST STOCK AND OTTO NICODEMUS; 0F HGCHST-ON-THE-MAIIN, GERMANY, ASSIGN- ons T0 FARBWEBKE VORM. MEISTER LUCIUS & BRfi'NING, 0F. HooHs'r-oN-THE- AIN, GERMANY, A CORPORATION OF GERMANY;

i DYES'OF TRIP HENYLMETHANE SERIES AND PROCESS OF MAKING SAME.

No Drawing.

To all whom it may concern:

chemist, citizens of the Empire of Germany,

, residing at Hchst-omthe-hlain, Germany, have nvented certain new and useful Improvements in Dyes of the Triphenylmetlr.

ane Series and Processes of Making Same,

of which the following is a specification.

In U. S. Patents Nos. 677,279 and (389,025

I are described red to .violetdyes'tufi's of the dyestuffs of the triphenylmethane series are also Very easily produced by condensing 1n presence of hydrochloric acid 4-halogen-4B- aminobenzophenone, its derivatlves substi- 'tuted in the amino group by a hydrocarbon residue and its homologues, that is to say,

ketones containing only one amino group,

with indols substituted in a-position. Although these products are of little technical value, they yield very :valuable dyestuffs by substituting for the halogen a residue of an aromatic amin. The dyestuffs thus obtained may, if required, be transformed by sulfonation into acid dyestuffs which are dark powders soluble in water with a violet to blue color,'in concentrated sulfiiric'acid with an orange-yellow color, turning vlolet to blue whenpoured in much water and dyeing wool violet to blue tints, remarkable for their greatfastness to light, and in this respect greatly surpass all vlolet acid dyestuffsof the triphenylmethane series hitherto known,

' particularly those described in the abovementioned U. S. patents.

The halogen aminobenzophenones to be I used can be produced with a very good technical yield according to German Patent No.

41:17:31 from anilids of para-halogenbenzoic acids with the corresponding-bases in presence of phosphorus oxychlorid.

The following examples illustrate our inyention, the parts being by weight.

Example I: 200 parts of the dyestuff, obtained. by condensing -l-chloro-l -d1methylaminobenzophenone (melting point 129430 C.) with N-ethyl-oc-phenylindol, are heated Specification of Letters Patent.

by means of common salt.

Patented Feb. 27, 191*".

Application filed June 22, 1915. Serial No. 35,616.

for 2 3 hours to 120-130 C. with 5-6 times Its weight of p-anisidin, whereupon the blush-iolet molten mass is poured. while stirring, into diluted acid and the dye-stuff thus separated is filtered off. When dry, the latter forms a powder with a bronze-like luster, which is scarcely soluble in 'water and dissolves in concentrated sulfuric acid with .an orange-yellow coloration. I

The sulfonatio'n of the dyestuff is effected by introducing it intoten times the quantity of sulfuric acid monohydrate and stirring at 60 C. until a sample dissolves in ammonia to a clear solution. The mass is then poured upon ice and the sodium salt, precipitated 4 v The resulting dyestuff dyes without blotting wool a bluishviolet tint of remarkable fastness to light.

' 'he n using et-chloro-4 C y zophenone (melting at 160 C.) and N-ethyla-phenylindol, a dyestuff possessing quite similar properties is obtained.

Example II: 200 parts of the dyestuff obtained by condensing 4-chloro-2 -methyl-4 e din'iethylaminobenzopherione (melting at 86 C'.) with N-ethyl-a-phenylindol are heated for 2-3 hours to 120130 C. with 5-6 times the-weight of p-phenetfiin, the blue molten mass is poured, while stirring, into diluted acid and the separated dyestuff filtered ofi. \Vhen dry, the dyestuff forms a powder of the following formula:

with a bronze-like luster, scarcely soluble in water, which, after sulfonation according to the indications in Example L-yields a sulfonic' facid, being-a dark po w( ler 'soluble in water with a reddish-blue color in concen t'rated sulfuric acid with an orange-yellow color, turning blue when poured in' much water, and dyelng wool reddish bhre tints of great fastness to light. If instead of plowish-re'd solution by heating for p'hejnetidin, p-a nisidin or p-toluidin are used,

dyestuffs of nearly the same properties are obtained;

Example III 200 parts of the dyestuflI' produced by condensing 4-chloroA -dimethylaminobenzophenone or el-chloro-P-dimethylaminobenzophenone or 4-chloro-4z -diethylaminobenzophenone with benzyl a methylindol (boiling at 220-230 ,C. and

im/m) are treated, as indicated in Examples I andTLwith p-phenetidin and the molten mass worked up in alike manner. The resulting dyestui'l', which is insoluble in water,

after being introduced into 10 times the quantity of monohydrate, dissolves to a yeland can be transformed a short time to G. into Iits'sulfonic ac d. 0 n pouring the mixture uponice and precipitating it by means'of common salt, the sodium salt thereof is ob- "tained which dyes wool violet tints of great dicated. By introducing the basic dyestufi into monohydrate and heating for a short I base the dyestuffs -50 to light and to time to 50, it is easily converted into the corresponding sulfonic acid which dyes wool bluish-violet tints of great fastness to light. When substituting for the 'p -toluidin, mtoluidin, p-phenetidin, or pfanisidin, dyestufis ofsimilar properties are obtained.

Example V: 200 parts of the dyestufi obtained by condensing 4-chl0ro-4 -dimethy1- aniinobenzophenone and N-ethyl-a-methylindosulfonic acid are treated with p-phenetidin" and: worked Thus a sulfonic acid is obtained which dyes wool bluish-Violet tints of excellent fastness alkalis. 1 Having now described'our invention, what we claim is:

1. The process of making violet to blue dyestuffs of the diarylindylmethane series, which consists in heating with an aromatic produced by condensing 4-halogen-4 -aminobenzophenones with an indol derivative substituted in (Z-POSltlOIl, and sulfonating those products of the reaction which do not yet contain any sulfo group.

- position,

up I as above indicated.

2. The process of making a new blue dyestufl of the diaryl-indylmethane series, which consists in heating with p-phenetidin the dyestuif obtained by condensing a- I chloro 2 methyl-4 -dimethylaminobenzophenone with N-ethyl-a-phenylindol, and sulfonating the coloring matter thus obtained. '3. The hereinbefore described new dyestufi's, being sulfonic acids of dyestuffs of the following formula:

wherein R and R stand for a hydrocarbon residue; Ar 'Ar Ar for aryl residues and X for an indol derivative substituted in abeing dark powders soluble in water w1th a violet to blue color, in concen-- trated sulfuric acid with an orange-yellow 1 color, turning. violet to blue when poured in much water, and dyeing wool violet to blue tints of excellent fastness to light.

a. The hereinbefore described dyestufi',being a 'sulfonic acid of the dyestuff of the following formula:

is n

a reddish-blue color, in concentrated sulfuric acid with an orange-yellow color, turning blue when poured in much water and dyeing wool a blue tint with a red hue of great fastness to light.

In testimony whereof, we aiiix our signatur'es in presence of two witnesses.

AUGUST STOCK. OTTO NICODEMUS Witnesses:-

JEAN- GRUND, CARL GRUND. 

